[XviD-devel] [BUG] BFrame encoder doesn't force intra for 1st frame

[peter ross]

>From: "Michael Militzer" <michael@xvid.org>
>Reply-To: xvid-devel@xvid.org
>To: <xvid-devel@xvid.org>
>Subject: Re: [XviD-devel] [BUG] BFrame encoder doesn't force intra for 1st 
>frame
>Date: Mon, 5 Aug 2002 01:37:05 +0200
>
>Hi,
>
> > > I get those results when using either divx5 bvop compatibility or 
>plain
> > > "xvid style". I'm glad that someone finally confirmed that problem.
> > > For me, the xvid decoder crashes on bframes (even if I #define
> > > #BFRAME_DEC), either the VFW in vdub and the DShow in WMP.
> > > Interesting is that gruel could see that the files produced in windows
> > > encoder are wrong (shows the same there), but if encoding in linux
> > > everything is fine.
> >
> > strange. Especially because for me here the encoded files seem not 
>broken,
> > DivX5 and ffdshow can play them from the very beginning. So I'd rather
> > suppose that something in the decoder part isn't perfect - but we'll
>see...
>
>I just commited a fix for the windows b-frame problems, at least for me
>everything works fine now.
>As supposed the unprocessed but queued frames caused the problem - I solved
>this problem by writing N_VOPs to the bitstream while the queue is being
>filled. Sure this is not the best solution because a delay is introduced
>even if we'd use .MP4 file format, but as long as the API doesn't support
>returning a status for every frame like processed/queued, there's nothing 
>we
>can do about it.
>
>btw: before my changes there was a BitstreamPutBits(&bs, 0x7f, 8);
>(encoder.c, l. 826) while the queue was being filled. I have to admit that 
>I
>don't really understand what this should do. Could the original author
>(pete?) explain it to me, please?
>

when virtualdub sees a 1-byte frame containing 0x7f it will ignore the 
output frame. (but only when the fourcc=DX50)

-- pete




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